Chien-Ko Wu, M.D.
NPI 1275680829 · Internal Medicine Physician · Orange, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Chien-Ko Wu, M.D. is a Internal Medicine Physician provider in Orange, CA (NPI 1275680829).
Provider details
- NPI number
- 1275680829
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A38491 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,168 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 444 | $122 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 342 | $138 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 133 | $98 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 105 | $194 |
| Insertion of Needle Into Vein (3 Years Or Older)36410 | 93 | $19 |
| Administration of Influenza Virus VaccineG0008 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 50 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 108 | 29 |
| Amlodipine Besylate | 95 | 29 |
| Rosuvastatin Calcium | 83 | 35 |
| Metformin Hcl | 75 | 22 |
| Atenolol | 74 | 18 |
| Levothyroxine Sodium | 64 | 15 |
| Metoprolol Tartrate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-01-05
- Last updated
- 2007-07-09
Frequently asked questions
- What is Chien-Ko Wu's NPI number?
- Chien-Ko Wu's National Provider Identifier (NPI) is 1275680829, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Chien-Ko Wu's specialty?
- Chien-Ko Wu is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Chien-Ko Wu located?
- Chien-Ko Wu's practice location on file with NPPES is 991 N Tustin St, Orange, CA 92867-5900.
- What is Chien-Ko Wu's phone number?
- The practice phone number listed in the NPPES registry for Chien-Ko Wu is (714) 639-6162.
- Does Chien-Ko Wu accept Medicare?
- Chien-Ko Wu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Chien-Ko Wu's NPI active?
- Yes — Chien-Ko Wu's NPI (1275680829) is active in the NPPES registry as of the last update on 2007-07-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.